Driving apparatus, lens driving apparatus and image pickup apparatus
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United States of America Patent
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-
Jun 14, 2011
Grant Date -
Oct 2, 2008
app pub date -
Mar 11, 2008
filing date -
Mar 28, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A driving apparatus comprises an actuator, the actuator comprising an electromechanical conversion element and a driving shaft attached to the electromechanical conversion element, wherein the driving apparatus expands and contracts the electromechanical conversion element by applying a driving signal to the electromechanical conversion element and reciprocally moves the driving shaft in accordance with expansion and contraction movement of the electromechanical conversion element so as to move a driven member frictionally engaged with the driving shaft, and wherein the driving signal is a pulse signal, and a time period corresponding to a half wavelength of a damping vibration displacement of a lowest resonance frequency in the actuator is set as a shorter output time among a high output time period and a low output time period of the driving signal.
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